On demand positioning reference signals and per band deployment aspects

1. A method of wireless communication performed by a user equipment (UE), comprising:

transmitting a first request for a first set of base stations to transmit first on demand positioning reference signals (PRS) in a first band;

measuring the first on demand PRS from the first set of base stations in the first band;

measuring periodic PRS from a second set of base stations operating in a second band different from the first band, wherein the UE transmits the first request for the first set of base stations to transmit the first on demand PRS in the first band based on a positioning need not satisfied by the periodic PRS transmitted by the second set of base stations; and

sending, to a positioning entity, positioning measurements of at least the first on demand PRS and the periodic PRS.

2. The method of claim 1 , further comprising:

transmitting, to a location server, a capability message indicating that the UE can support operation on at least the first band and the second band.

3. The method of claim 2 , further comprising:

receiving, from the location server, assistance information for at least the first set of base stations and the second set of base stations.

4. The method of claim 3 , wherein the assistance information includes locations of at least the first set of base stations and the second set of base stations.

5. The method of claim 3 , wherein the assistance information indicates at least a number of the first set of base stations operating in the first band and a number of the second set of base stations operating in the second band.

6. The method of claim 1 , further comprising:

determining at least a number of the first set of base stations operating in the first band and a number of the second set of base stations operating in the second band based on detecting at least the first on demand PRS and the periodic PRS.

7. The method of claim 6 , further comprising:

determining a number of a third set of base stations capable of transmitting second on demand PRS in a third band.

8. The method of claim 7 , wherein the UE transmits the first request to the first set of base stations based on the number of the first set of base stations compared to the number of the third set of base stations.

9. The method of claim 1 , further comprising:

receiving an indication that only the first band supports on demand PRS.

10. The method of claim 1 , wherein:

the first request is transmitted on the first band, and

the first request being transmitted on the first band indicates that the first request is for the first set of base stations to transmit the first on demand PRS in the first band.

11. The method of claim 1 , wherein the first request is transmitted on the second band.

12. The method of claim 1 , wherein the first request includes an identifier of the first band.

13. The method of claim 1 , wherein the positioning need is based on a geometric dilution of precision (GDOP) threshold.

14. The method of claim 1 , further comprising:

transmitting a second request for a third set of base stations to transmit second on demand PRS in a third band;

measuring the second on demand PRS from the third set of base stations in the third band; and

sending, to the positioning entity, positioning measurements of the second on demand PRS.

15. The method of claim 1 , wherein the UE transmits the first request to each of the first set of base stations.

16. The method of claim 1 , wherein:

the UE transmits the first request to a location server or a serving base station, and

the first request is sent by the location server or the serving base station to each of the first set of base stations.

17. The method of claim 1 , wherein:

the first band comprises a first frequency range, a first frequency band, a first component carrier, or a first positioning frequency layer, and

the second band comprises a second frequency range, a second frequency band, a second component carrier, or a second positioning frequency layer.

18. The method of claim 1 , wherein:

the positioning entity comprises a positioning engine at the UE, and

the method further comprises calculating a location of the UE based on the positioning measurements of at least the first on demand PRS and the periodic PRS.

19. The method of claim 1 , wherein

the positioning entity comprises a location server or a serving base station.

20. A user equipment (UE), comprising:

a memory;

at least one transceiver; and

at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:

cause the at least one transceiver to transmit a first request for a first set of base stations to transmit first on demand positioning reference signals (PRS) in a first band;

measure the first on demand PRS from the first set of base stations in the first band;

measure periodic PRS from a second set of base stations operating in a second band different from the first band, wherein the UE transmits the first request for the first set of base stations to transmit the first on demand PRS in the first band based on a positioning need not satisfied by the periodic PRS transmitted by the second set of base stations; and

send, to a positioning entity, positioning measurements of at least the first on demand PRS and the periodic PRS.

21. The UE of claim 20 , wherein the at least one processor is further configured to:

cause the at least one transceiver to transmit, to a location server, a capability message indicating that the UE can support operation on at least the first band and the second band.

22. The UE of claim 21 , wherein the at least one processor is further configured to:

receive, from the location server via the at least one transceiver, assistance information for at least the first set of base stations and the second set of base stations.

23. The UE of claim 22 , wherein the assistance information includes locations of at least the first set of base stations and the second set of base stations.

24. The UE of claim 22 , wherein the assistance information indicates at least a number of the first set of base stations operating in the first band and a number of the second set of base stations operating in the second band.

25. The UE of claim 20 , wherein the at least one processor is further configured to:

determine at least a number of the first set of base stations operating in the first band and a number of the second set of base stations operating in the second band based on detecting at least the first on demand PRS and the periodic PRS.

26. The UE of claim 25 , wherein the at least one processor is further configured to:

determine a number of a third set of base stations capable of transmitting second on demand PRS in a third band.

27. The UE of claim 26 , wherein the at least one processor is configured to cause the at least one transceiver to transmit the first request to the first set of base stations based on the number of the first set of base stations compared to the number of the third set of base stations.

28. The UE of claim 20 , wherein the at least one processor is further configured to:

receive, via the at least one transceiver, an indication that only the first band supports on demand PRS.

29. The UE of claim 20 , wherein:

the first request is transmitted on the first band, and

the first request being transmitted on the first band indicates that the first request is for the first set of base stations to transmit the first on demand PRS in the first band.

30. The UE of claim 20 , wherein the first request is transmitted on the second band.

31. The UE of claim 20 , wherein the first request includes an identifier of the first band.

32. The UE of claim 20 , wherein the positioning need is based on a geometric dilution of precision (GDOP) threshold.

33. The UE of claim 20 , wherein the at least one processor is further configured to:

cause the at least one transceiver to transmit a second request for a third set of base stations to transmit second on demand PRS in a third band;

measure the second on demand PRS from the third set of base stations in the third band; and

send, to the positioning entity, positioning measurements of the second on demand PRS.

34. The UE of claim 20 , wherein the at least one processor is configured to cause the at least one transceiver to transmit the first request to each of the first set of base stations.

35. The UE of claim 20 , wherein:

wherein the at least one processor is configured to cause the at least one transceiver to transmit the first request to a location server or a serving base station, and

the first request is sent by the location server or the serving base station to each of the first set of base stations.

36. The UE of claim 20 , wherein:

the first band comprises a first frequency range, a first frequency band, a first component carrier, or a first positioning frequency layer, and

the second band comprises a second frequency range, a second frequency band, a second component carrier, or a second positioning frequency layer.

37. The UE of claim 20 , wherein:

the positioning entity comprises the UE, and

the at least one processor is further configured to calculate a location of the UE based on the positioning measurements of at least the first on demand PRS and the periodic PRS.

38. The UE of claim 20 , wherein the positioning entity comprises a location server or a serving base station.

39. A user equipment (UE), comprising:

means for transmitting a first request for a first set of base stations to transmit first on demand positioning reference signals (PRS) in a first band;

means for measuring the first on demand PRS from the first set of base stations in the first band;

means for measuring periodic PRS from a second set of base stations operating in a second band different from the first band, wherein the UE transmits the first request for the first set of base stations to transmit the first on demand PRS in the first band based on a positioning need not satisfied by the periodic PRS transmitted by the second set of base stations; and

means for sending, to a positioning entity, positioning measurements of at least the first on demand PRS and the periodic PRS.

40. A non-transitory computer-readable medium storing computer-executable instructions, the computer-executable instructions comprising:

at least one instruction instructing a user equipment (UE) to transmit a first request for a first set of base stations to transmit first on demand positioning reference signals (PRS) in a first band;

at least one instruction instructing the UE to measure the first on demand PRS from the first set of base stations in the first band;

at least one instruction instructing the UE to measure periodic PRS from a second set of base stations operating in a second band different from the first band, wherein the UE transmits the first request for the first set of base stations to transmit the first on demand PRS in the first band based on a positioning need not satisfied by the periodic PRS transmitted by the second set of base stations; and

at least one instruction instructing the UE to send, to a positioning entity, positioning measurements of at least the first on demand PRS and the periodic PRS.